/**
 * Copyright (c) 2010 by Kevin Bierhoff.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    3. Neither the names of the authors nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.googlecode.syper.javasyp.formulae;

import org.eclipse.jdt.core.dom.PrefixExpression.Operator;

/**
 * @author kevin
 * @since Jan 30, 2010
 *
 */
public class Prefix implements Formula {
	
	public static Prefix not(Formula f) {
		return new Prefix(Operator.NOT, f);
	}
	
	private final Operator op;
	private final Formula rhs;

	public Prefix(Operator op, Formula rhs) {
		super();
		if (Operator.DECREMENT.equals(op) || Operator.INCREMENT.equals(op))
			throw new IllegalArgumentException("What are you thinking?? " + op);
		this.op = op;
		this.rhs = rhs;
	}

	public Operator getOp() {
		return op;
	}

	public Formula getRhs() {
		return rhs;
	}

	@Override
	public <T> T dispatch(FormulaVisitor<T> visitor) {
		return visitor.visit(this);
	}

	@Override
	public boolean isBoolean() {
		return rhs.isBoolean() || Operator.NOT.equals(op);
	}
	
	@Override
	public String toString() {
		return op + " " + rhs;
	}

}
